var centerPanel = Ext.create('Ext.tab.Panel', {
	region: 'center',
	html: 'Hello world',
	activeTab: 0,
	items: [{
		//contentEl: 'center1',
		title: 'Tab1',
		closable: true,
		autoScroll: true
	}, {
		title: 'Tab2',
		autoScroll: true
	}]
});